Determining femoral component goodness-of-fit using computer segmentation and numerical simulation

[摘要] ENGLISH ABSTRACT: The c2 goodness-of-fit (GOF) test was used to determine which standard femoralcomponent would achieve the best geometrical fit for a specific patient. This was doneby creating 3D models from computerized tomography scan data through computersegmentation using Materialise MIMICS. The second step was to measure themorphological dimensions of the distal femur whereof twelve were selected andcompared to the dimensions of two commercial femoral prosthesis designs. Thirdly,cadaveric femurs were scanned with a 3D desktop scanner to create a database withthe dimensions of healthy knees. The 3D model database of the cadaveric femursincluded cartilage layer. A cartilage thickness was added to the CT knee dimensionsusing a self-organizing map (SOM) calculation based on the healthy knee database.The developed method calculated alignment angles with higher accuracy than presentlyused and determined preoperatively which size to implant. Kinematic simulations of totalknee arthroplasty (TKA) knees were compared to normal knee simulations created inLifeMOD. The articulating surface was the only variable changed between the twosimulations and the kinematics of different sizes were evaluated. A method was createdto scale the femoral component using the standard available sizes. The completedproject will be used as foundation for customization of TKA prostheses.

[发布机构] Stellenbosch University